Audi A5 with 1.8 TFSI misfiring
 

Hello All,
New to the forum but would apreciate any help I can get.
I have a 1.8 TFSI engine sitting in a Audi A5 (motorcode CABD)

Idle running is very rough, and it seems to be missfiring.
When running on the road (not on idle) it seems to be running fine.

VCDS gave me this readout:

Address 01: Engine (------CABD) Labels: 06H-907-115-CAB.clb Part No SW: 8T0 907 115 A HW: 8K1 907 115 Component: 1.8l R4/4V TF H07 0004 4 Faults Found: 5646 - Leak in Air Intake System P2279 00 [039] - - Not Confirmed - Tested Since Memory Clear Freeze Frame: Fault Status: 00000001 Fault Priority: 2 Fault Frequency: 1 Mileage: 175866 km Date: 2015.10.15 Time: 15:52:37 2811 - Fuel Trim; Bank 1 P0171 00 [101] - System Too Lean Not Confirmed - Tested Since Memory Clear Freeze Frame: Fault Status: 00000001 Fault Priority: 2 Fault Frequency: 1 Mileage: 175863 km Date: 2015.10.15 Time: 10:31:50 4007 - Idle Control System RPM P0507 00 [168] - Higher than Expected. MIL ON - Intermittent - Confirmed - Tested Since Memory Clear Freeze Frame: Fault Status: 00000001 Fault Priority: 2 Fault Frequency: 2 Mileage: 175868 km Date: 2015.10.15 Time: 15:56:08 4010 - Idle Control System P0506 00 [038] - RPM Lower than Expected Intermittent - Not Confirmed - Tested Since Memory Clear Freeze Frame: Fault Status: 00000001 Fault Priority: 2 Fault Frequency: 1 Mileage: 176119 km Date: 2015.10.18 Time: 12:22:32
I have changed the sparkplugs, and tried changing the ignition coils one at a time (with a new one, trying every cylinder, one at a time) but did not succeed.
I should also mention that the new ignition coil was very cheap (bad) quality as it was the only one I could get hold of at 5 p.m. on a saturday afternoon.
Will try to get hold of another one (better build quality) tomorrow.

From the fault code readout. Do you guys have any idea of what the problem could be?
Faulty MAF sensor?

Any help is much appreciated. Many thanks in advance.

Mattias